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Keystone, South Dakota facts for kids

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Keystone, South Dakota
Business district in Keystone
Business district in Keystone
"Home of Mount Rushmore"
Location in Pennington County and the state of South Dakota
Location in Pennington County and the state of South Dakota
Country United States
State South Dakota
County Pennington
 • Total 3.00 sq mi (7.77 km2)
 • Land 3.00 sq mi (7.77 km2)
 • Water 0.00 sq mi (0.00 km2)
4,331 ft (1,320 m)
 • Total 240
 • Density 114.33/sq mi (44.15/km2)
Time zone UTC-7 (Mountain (MST))
 • Summer (DST) UTC-6 (MDT)
ZIP code
Area code(s) 605
FIPS code 46-33820
GNIS feature ID 1261912

Keystone is a town in the Black Hills region of Pennington County, South Dakota, United States. The population was 240 at the 2020 census. It had its origins in 1883 as a mining town, and has since transformed itself into a resort town, serving the needs of the millions of visitors to the Mount Rushmore National Memorial, which is located just beyond city limits. Keystone was heavily damaged in the 1972 Black Hills flood.

The town took its name from a local mine, which most likely was named after the keystone Masonic symbol.


Keystone is located at 43°53′37″N 103°25′34″W / 43.893744°N 103.426080°W / 43.893744; -103.426080.

According to the United States Census Bureau, the town has a total area of 2.86 square miles (7.41 km2), all of it land.

Keystone has been assigned the ZIP code 57751 and the FIPS place code 33820.


Historical population
Census Pop.
1980 295
1990 232 −21.4%
2000 311 34.1%
2010 337 8.4%
2020 240 −28.8%
U.S. Decennial Census

2010 census

At the 2010 census there were 337 people, 153 households, and 81 families living in the town. The population density was 117.8 inhabitants per square mile (45.5/km2). There were 230 housing units at an average density of 80.4 per square mile (31.0/km2). The racial makeup of the town was 93.8% White, 3.3% Native American, 0.6% Asian, 0.3% Pacific Islander, 0.3% from other races, and 1.8% from two or more races. Hispanic or Latino of any race were 8.3%.

Of the 153 households 23.5% had children under the age of 18 living with them, 39.2% were married couples living together, 8.5% had a female householder with no husband present, 5.2% had a male householder with no wife present, and 47.1% were non-families. 34.0% of households were one person and 10.4% were one person aged 65 or older. The average household size was 2.20 and the average family size was 2.83.

The median age in the town was 42.8 years. 22.3% of residents were under the age of 18; 3.8% were between the ages of 18 and 24; 27.5% were from 25 to 44; 33.5% were from 45 to 64; and 12.8% were 65 or older. The gender makeup of the town was 50.7% male and 49.3% female.

Arts and culture

Among its tourist attractions is the Black Hills Central Railroad, built in 1900 for Black Hills gold. It now operates passenger trains pulled by preserved steam locomotives.

Another prominent local attraction is The National Presidential Wax Museum, which features wax sculptures of every president in U.S. history and several notable Sioux Chiefs, inventors, and international political figures. The wax figures are the work of world-renowned wax sculptor Katherine Stubergh whose notable works include wax figures used in Gone With the Wind and the 1953 film House of Wax.

Carrie Ingalls (sister of Little House on the Prairie author Laura Ingalls Wilder) spent a significant part of her adult life there, living with her husband David N. Swanzey and his children. Her sister Mary Ingalls lived with them for a while and died here in 1928.

Bobby Buntrock, who played Harold on the TV series Hazel is buried in Keystone.

This town was one of the filming locations for the Columbia Pictures 1994 comedy film North.

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